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Q.

If a – b = 4 and ab = 21, find the value of Question Image


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a

316

b

317

c

318

d

319 

answer is A.

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Detailed Solution

Concept- Find the value of Question Image by using the identity of Question Image, which is equal to Question Image. Perform the square of both sides in the formula a - b = 4, and after examining the Question Imageexpression, we will see that one of the terms is Question Image, thus we can then use this value to replace aQuestion Image in the Question Image identity.
 Given,
a-b=4, ab=21
Thus,
Question ImageHence, the correct answer is option 1.
 
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